Argon Elemental Symbol
Argon



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Argon Argon Argo Argônio Argón Argon

Argon Bohr ModelArgon is a Block P, Group 18, Period 3 element. The number of electrons in each of Argon's shells is 2, 8, 8 and its electronic configuration is [Ne] 3s2 3p6. In its elemental form argon's CAS number is 7440-37-1. The argon atom has a covalent radius of 106±10.pm and it's Van der Waals radius is 188.pm. Air is the primary raw material used to produce argon products. Argon constitutes 1.28% by mass and 0.934% by volume of the Earth's atmosphere. Argon was discovered and first isolated by Lord Raleigh and Sir William Ramsay in 1894. Argon was the first noble gas to be discovered.

Argon is non-toxic. Argon information, including technical data, safety data and its high purity properties, research, applications and other useful facts are specified below. Scientific facts such as the atomic structure, ionization energy, abundance on Earth, conductivity and thermal properties are included.


    • Properties
    • Safety Data
    • Research
    • Isotopes
    • Other Elements

    Argon Properties


    GENERAL PROPERTIES   PHYSICAL PROPERTIES  
    Symbol: Ar Melting Point: -189.36 oC, -308.848 oF, 83.79 K
    Atomic Number: 18 Boiling Point: -185.85 oC, -302.53 oF, 87.3 K
    Atomic Weight: 39.95 Density: 1656 (40 K) kg m-3
    Element Category: noble gases Liquid Density @ Melting Point: 1.40 g·cm−3
    Group, Period, Block: 18, 3, p Specific Heat: N/A
        Heat of Vaporization 6.53 kJ mol-1
    CHEMICAL STRUCTURE Heat of Fusion 1.21 kJ mol-1
    Electrons: 18 Thermal Conductivity: 17.72x10-3  W·m−1·K−1
    Protons: 18 Thermal Expansion: N/A
    Neutrons: 22 Electrical Resistivity: N/A
    Electron Configuration: [Ne]3s23p6 Electronegativity: N/A
    Atomic Radius: N/A Tensile Strength: N/A
    Covalent Radius: 106±10 pm Molar Heat Capacity: 5R/2 = 20.786 (Cp) J·mol−1·K−1
    Van der Waals radius: 188 pm Young's Modulus: N/A
    Oxidation States: 0 Shear Modulus: N/A
    Phase: Gas Bulk Modulus: N/A
    Crystal Structure: face-centered cubic Poisson Ratio: N/A
    Magnetic Ordering: diamagnetic Mohs Hardness: N/A
    1st Ionization Energy: 1520.58 kJ mol-1 Vickers Hardness: N/A
    2nd Ionization Energy: 2665.88 kJ mol-1 Brinell Hardness: N/A
    3rd Ionization Energy: 3930.84 kJ mol-1 Speed of Sound: (gas, 27 °C) 323 m·s−1
           
    IDENTIFIERS   MISCELLANEOUS  
    CAS Number: 7440-37-1 Abundance in typical human body, by weight: N/A
    ChemSpider ID: 22407 Abundance in typical human body, by atom: N/A
    PubChem CID: 23968 Abundance in universe, by weight: 200000 ppb
    MDL Number: MFCD00003431 Abundance in universe, by atom: 6000 ppb
    EC Number: 231-147-0 Discovered By: Lord Rayleigh and William Ramsay
    Beilstein Number: N/A Discovery Date: 1894
    SMILES Identifier: [Ar]  
    InChI Identifier: InChI=1S/Ar Other Names: Argo, Argônio
    InChI Key: XKRFYHLGVUSROY-UHFFFAOYSA-N  
           
           
           
           
           


    Recent Research & Development for Argon

    • Jie Han, Xiao-dong Wang, De-chun Ba, Coordinated analysis of multiple factors of argon blowing parameters on the effect of circulation flow rate in RH vacuum refining process, Vacuum, Volume 109, November 2014
    • Guo-lu Li, Jian-long Ma, Hai-dou Wang, Jia-jie Kang, Bin-shi Xu, Effects of argon gas flow rate on the microstructure and micromechanical properties of supersonic plasma sprayed nanostructured Al2O3-13 wt.%TiO2 coatings, Applied Surface Science, Volume 311, 30 August 2014
    • Lucas A. Mitchell, Trenton M. Tovar, M. Douglas LeVan, High pressure excess isotherms for adsorption of oxygen and argon in a carbon molecular sieve, Carbon, Volume 74, August 2014
    • Naresh T. Deoli, Lucas C. Phinney, Duncan L. Weathers, Ion fluence dependence of the total sputtering yield and differential angular sputtering yield of bismuth due to 50 keV argon ion irradiation, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 332, 1 August 2014
    • Alexander M. Plokhotnichenko, Stepan G. Stepanian, Ludwik Adamowicz, Unusual behavior of the pyrimidine–2-hydroxypyrimidine heterodimer isolated in argon matrices, Chemical Physics Letters, Volume 608, 21 July 2014
    • G. Isbary, T. Shimizu, J.L. Zimmermann, J. Heinlin, S. Al-Zaabi, M. Rechfeld, G.E. Morfill, S. Karrer, W. Stolz, Randomized placebo-controlled clinical trial showed cold atmospheric argon plasma relieved acute pain and accelerated healing in herpes zoster, Clinical Plasma Medicine, Available online 15 July 2014
    • V. Bolleddu, V. Racherla, P.P. Bandyopadhyay, Microstructural and tribological characterization of air plasma sprayed nanostructured alumina–titania coatings deposited with nitrogen and argon as primary plasma gases, Materials & Design, Volume 59, July 2014
    • A.K. Jazmati, K. Alnama, A. Alkhawwam, Spatial characterization of laser induced Yb plasma in argon using optical emission spectroscopy: Pressure effect, Applied Surface Science, Available online 17 June 2014
    • Slawomir Boncel, Krzysztof K.K. Koziol, Enhanced graphitization of c-CVD grown multi-wall carbon nanotube arrays assisted by removal of encapsulated iron-based phases under thermal treatment in argon, Applied Surface Science, Volume 301, 15 May 2014
    • Ngoc-Long Do, Enric Garcia-Caurel, Nicolas Bérerd, Nathalie Moncoffre, Dominique Gorse - Pomonti, Corrosion under argon irradiation of titanium in the low MeV range: A study coupling AFM and Spectroscopic Ellipsometry, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 327, 15 May 2014
    • I.O. Usov, S. Rubanov, J. Won, A.A. Suvorova, Transformation of YSZ under high fluence argon ion implantation, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 326, 1 May 2014.
    • Mohammad Erfanmanesh, Saeed Reza Bakhshi, Mohammad Khajelakzay, Mostafa Salekbafghi, The effect of argon shielding gas at plasma spray process on the structure and properties of MoSi2 coating, Ceramics International, Volume 40, Issue 3, April 2014
    • Chong-lin LIU, Zhi-guo LUO, Tao ZHANG, Shen DENG, Nan WANG, Zong-shu ZOU, Mathematical Modeling of Multi-sized Argon Gas Bubbles Motion and Its Impact on Melt Flow in Continuous Casting Mold of Steel, Journal of Iron and Steel Research, International, Volume 21, Issue 4, April 2014
    • Ngoc-Long Do, Enric Garcia-Caurel, Nicolas Bérerd, Nathalie Moncoffre, Dominique Gorse - Pomonti, Determination of thicknesses of oxide films grown on titanium under argon irradiation by spectroscopic ellipsometry, Journal of Nuclear Materials, Volume 447, Issues 1–3, April 2014
    • Ruijuan Qiao, Qi Wang, Yingchun Liu, Abnormal transport properties of Argon confined in carbon nanotube driven by a temperature gradient, Chemical Physics Letters, Volume 597, 28 March 2014
    • M.A. Ridenti, N. Spyrou, J. Amorim, The crucial role of molecular ions in the radial contraction of argon microwave-sustained plasma jets at atmospheric pressure, Chemical Physics Letters, Volumes 595–596, 18 March 2014
    • M. Bišćan, Z. Kregar, N. Krstulović, S. Milošević, Spectroscopic characterization of laser-produced GaAs plasma in helium and argon background gases, Optics Communications, Volume 315, 15 March 2014
    • Wang Zhang, Xueming Hua, Wei Liao, Fang Li, Min Wang, Study of metal transfer in CO2 laser+GMAW-P hybrid welding using argon–helium mixtures, Optics & Laser Technology, Volume 56, March 2014
    • Xin Hao, Yuanfu Chen, Zegao Wang, Jingbo Liu, Fei Qi, Morphology and structure of epitaxial graphene grown on 6H–SiC (0001) substrates by modified argon-assisted epitaxial method, Materials Letters, Volume 115, 15 January 2014
    • H. Stenberg, J. Maaranen, M. Suvanto, T.T. Pakkanen, Solvent-assisted and thermal wrinklings of argon plasma treated polystyrene coatings on silicon substrate, Surface and Coatings Technology, Volume 238, 15 January 2014

    Argon Isotopes


    Argon has three stable isotopes: 36Ar, 38Ar, and 40Ar.

    Nuclide Symbol Isotopic Mass Half-Life Nuclear Spin
    36Ar 35.967545106 Observationally Stable 0+
    38Ar 37.9627324 Stable 0+
    40Ar 39.9623831225 Stable 0+